View of a tent camp and members of the Hayden Survey (U.S. Geological Survey of the Territories, 1871) at the base of the Wasatch Mountains near Ogden, Weber County, Utah. Men stand near tents and covered wagons; survey tripods and equipment is by...

View of bubbling mud springs near the shores of Yellowstone Lake, close to the Hayden Survey (U.S. Geological Survey of the Territories, 1871) encampment, Yellowstone National Park, Wyoming. Shows a denuded area with cracked mud, surrounded by...

View of the Hayden Survey encampment (U.S. Geological Survey of the Territories, 1871) on a grassy plain at the base of Emigrant Peak, an ancient caldera near the east bank of the Yellowstone River in Park County, Montana. Shows canvas tents and...

Members of the Hayden Survey (U.S. Geological Survey of the Territories of 1871), sit in a boat, with a tent-fly as a sail and oars, near the shore of Yellowstone Lake, Yellowstone National Park, Wyoming. A canvas drape on the side of the boat...

Two members of the Hayden Survey (U.S. Geological Survey of the Territories, 1871) sit in a boat with oars and a sail near a rocky shore on Yellowstone Lake, Yellowstone National Park, Wyoming. A canvas drape on the side of the boat reads:...

A group of fifteen men from the 1871 Hayden Survey (U.S. geological Survey of the Territories) stand by Yellowstone Lake, near the mouth of Bridge Creek, opposite Stevenson's Island, Yellowstone National Park, Wyoming. Shows canvas tents, gear and...

View of a two year old elk with horns covered in "velvet" lying near a fallen tree, shot by members of the Hayden Survey (U.S. Geological Survey of the Territories, 1871), possibly in Yellowstone National Park, Wyoming.

View of Emigrant Peak and a ranch on the Yellowstone River, Yellowstone National Park, Wyoming. Frederick and Phillip Bottler owned this ranch where the Hayden Survey (U.S. Geological Survey of the Territories, 1871) left wagons and extra baggage...

View of the Hayden Survey (U.S Geological Survey of the Territories, 1871) encampment on Yellowstone Lake, Yellowstone National Park, Wyoming. Nineteen people stand ready for work near a camp fire. Shows a canvas tent, the wood wheeled odometer...

Two hunters for the Hayden Survey (U.S. Geological Survey of the U.S. Territories) identified as Jose and Joe Clark, pose on horseback after a successful hunt in Yellowstone National Park, Wyoming. One of the men is Black (African American). Shows...

View of the Hayden Survey (U.S. Geological Survey of the U.S. Territories, 1871) encampment on the ranch of Frederick and Phillip Bottler at the base of Emigrant Peak and the Yellowstone Mountains (Absaroka Range), Park County, Montana. Shows...

Members of the survey crew pose at a campsite in Yosemite Valley (later Yosemite National Park) in Maricopa County, California. Men wear sack suits and hats and pose with pack horses and mules. Men stand beside survey equipment that includes a...

View of accreted silica terraces and basins of calcareous deposits at Mammoth Hot Springs on the Gardner River (Gardiners River), Yellowstone National Park, Wyoming. Shows the camp of the Hayden Expedition with canvas tents, a teepee and horses...

A horse-drawn covered wagon stops on a dirt road between buttes on a wide open prairie in either Fremont County, Idaho, or Beaverhead County, Montana. Gear sits on the ground by the wagon; riders stand near their horses, mountains are in the far...

View of Red Rock Butte, at Red Rock Pass, a few miles south of Downey, in Bannock County, Idaho. Men and boys pose in the foreground; the sandstone formation and the Hayden Expedition campsite are in the distance. This is the location of the outlet...

Two men sit and stand in the alpine meadow of a glacial bowl below Garfield Mountain (Mount Garfield), in the Red Rock Mountain Range in Beaverhead County, Montana. Shows a fallen tree, mountains, snow, pine forests in the distance.

Men, members of a Denver & Salt Lake railroad survey crew, hold ropes and walk across catwalks made of logs secured with rope above the Colorado River in Gore Canyon (Grand County), Colorado. Men wear pants tucked into tall boots, jackets and hats....

Men, members of a survey crew for the Denver & Salt Lake Railroad, stand on a rock cliff above the Colorado River in Gore Canyon (Grand County), Colorado. Men wear pants, boots, jackets and hats. Shows a catwalk made of logs supported with ropes.

View of Grotto Geyser a hot spring at the lower end of the Upper Basin, Yellowstone National Park, Wyoming. Shows pools of water, silica deposits, and steam over the thermal spring. Forests are in the distance.

Four men in work clothes sit and stand with a woman on a dirt road by the Ogden River in Ogden Canyon, near Ogden (Weber County), Utah. Shows steep rock cliffs in a narrow gorge with striated quartzite rock formations.

View of Yellowstone Lake, looking south where the Yellowstone River leaves the lake, Yellowstone National Park, Wyoming. Shows a narrow sandbar with footprints, marsh, tall pines. Stevenson Island and the Absaroka Range are in the distance.

View of a valley of the Yellowstone, Yellowstone National Park, Wyoming. Shows channels and small islands in the Yellowstone River, rock formations, trees, and brush. The Absaroka Range and Emigrant Peak are in the distance.

View of Virginia City, looking north in (Madison County) Montana. Shows a rocky barren landscape with a gulch, a main street lined with frame buildings, log buildings and fences at the foot of Alder Gulch, a placer mining district.